:root {
  --page: #f8f9fb;
  --card: #ffffff;
  --ink: #0f172a;
  --sub: #64748b;
  --line: #e9edf3;
  --hero: #121316;
  --hero-sub: #9aa3af;
  --hero-nested: #23262b;
  --green: #10b981;
  --amber: #f59e0b;
  --indigo: #6366f1;
  --slate: #94a3b8;
  --r-lg: 28px;
  --r-md: 20px;
  --r-sm: 14px;
  --maxw: 1080px;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font-family: system-ui, -apple-system, "HarmonyOS Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 22px; }

/* ---------- 顶部 ---------- */
.site-head {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(248, 249, 251, 0.82);
  backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid transparent;
}

.site-head .wrap {
  display: flex;
  align-items: center;
  gap: 12px;
  height: 64px;
}

.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 17px; text-decoration: none; }
.brand img { width: 30px; height: 30px; border-radius: 9px; display: block; }

.nav { margin-left: auto; display: flex; align-items: center; gap: 22px; }
.nav a { text-decoration: none; font-size: 14px; color: var(--sub); }
.nav a:hover { color: var(--ink); }
.nav .pill {
  background: var(--hero);
  color: #f8fafc;
  padding: 9px 16px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 500;
}
.nav .pill:hover { color: #fff; }

/* ---------- Hero ---------- */
.hero { padding: 64px 0 40px; }
.hero .wrap {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 48px;
  align-items: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--sub);
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 6px 14px;
}
.eyebrow i { width: 7px; height: 7px; border-radius: 50%; background: var(--green); display: block; }

h1 { font-size: 44px; line-height: 1.25; letter-spacing: -0.5px; margin: 22px 0 0; font-weight: 800; }
.lede { font-size: 17px; color: var(--sub); margin: 16px 0 0; max-width: 30em; }

.cta-row { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; margin-top: 28px; }
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border-radius: 999px;
  padding: 13px 22px;
  font-size: 15px;
  font-weight: 500;
  text-decoration: none;
  border: 1px solid transparent;
}
.btn-primary { background: var(--hero); color: #f8fafc; }
.btn-primary:hover { background: #000; }
.btn-ghost { background: var(--card); border-color: var(--line); color: var(--ink); }
.btn-ghost:hover { border-color: #cbd5e1; }
.btn[aria-disabled="true"] { background: var(--card); border-color: var(--line); color: var(--sub); cursor: default; }

.hero-points { display: flex; flex-wrap: wrap; gap: 18px; margin-top: 26px; font-size: 14px; color: var(--sub); }
.hero-points span { display: inline-flex; align-items: center; gap: 7px; }
.hero-points i { width: 8px; height: 8px; border-radius: 50%; display: block; }

/* 手机 */
.hero-art { display: flex; justify-content: center; }
.phone {
  width: 296px;
  padding: 11px;
  border-radius: 46px;
  background: #14161a;
  box-shadow: 0 40px 70px -28px rgba(15, 23, 42, 0.5), 0 2px 6px rgba(15, 23, 42, 0.08);
}
.phone img { display: block; width: 100%; height: auto; border-radius: 36px; }

/* ---------- 通用 section ---------- */
section { padding: 56px 0; }
.sec-head { max-width: 40em; margin-bottom: 30px; }
.sec-head h2 { font-size: 30px; margin: 0; font-weight: 800; letter-spacing: -0.3px; }
.sec-head p { color: var(--sub); margin: 12px 0 0; font-size: 16px; }

/* ---------- 功能 ---------- */
.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.card {
  background: var(--card);
  border-radius: var(--r-md);
  padding: 24px;
  border: 1px solid var(--line);
}
.card h3 { margin: 14px 0 0; font-size: 17px; font-weight: 700; }
.card p { margin: 8px 0 0; font-size: 14px; color: var(--sub); }
.dot { width: 10px; height: 10px; border-radius: 50%; display: block; }
.dot-green { background: var(--green); }
.dot-amber { background: var(--amber); }
.dot-indigo { background: var(--indigo); }
.dot-slate { background: var(--slate); }
.dot-hero { background: var(--hero); }

/* ---------- 截图 ---------- */
.shots { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.shot figcaption { margin-top: 12px; font-size: 13px; color: var(--sub); text-align: center; }
.shot .frame {
  border-radius: 26px;
  background: #14161a;
  padding: 7px;
  box-shadow: 0 22px 40px -24px rgba(15, 23, 42, 0.45);
}
.shot img { display: block; width: 100%; height: auto; border-radius: 20px; }

/* ---------- 隐私 ---------- */
.privacy-band {
  background: var(--hero);
  color: #f8fafc;
  border-radius: var(--r-lg);
  padding: 40px;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 32px;
  align-items: center;
}
.privacy-band h2 { margin: 0; font-size: 28px; font-weight: 800; }
.privacy-band p { color: var(--hero-sub); margin: 14px 0 0; font-size: 15px; }
.privacy-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 12px; }
.privacy-list li {
  background: var(--hero-nested);
  border-radius: var(--r-sm);
  padding: 13px 16px;
  font-size: 14px;
  color: #e2e8f0;
  display: flex;
  gap: 10px;
  align-items: flex-start;
}
.privacy-list i { margin-top: 8px; }
.privacy-band .btn-ghost { background: transparent; border-color: #3a3f47; color: #f8fafc; margin-top: 22px; }

/* ---------- 页脚 ---------- */
.site-foot { padding: 56px 0 40px; }
.site-foot .wrap { display: grid; gap: 8px; }
.foot-brand { display: flex; align-items: center; gap: 10px; font-weight: 700; }
.foot-brand img { width: 26px; height: 26px; border-radius: 8px; }
.foot-note { color: var(--sub); font-size: 13px; margin: 0; }
.foot-note a { color: var(--sub); text-decoration: none; border-bottom: 1px solid var(--line); }
.foot-note a:hover { color: var(--ink); }
.foot-icp { margin-top: 10px; font-size: 13px; }
.foot-icp a { color: var(--sub); text-decoration: none; }
.foot-icp a:hover { color: var(--ink); text-decoration: underline; }

/* ---------- 法规页 ---------- */
.doc { max-width: 760px; margin: 0 auto; padding: 40px 22px 80px; }
.doc .doc-head { display: flex; align-items: center; gap: 12px; margin-bottom: 8px; }
.doc .doc-head img { width: 28px; height: 28px; border-radius: 8px; }
.doc .doc-head a { font-size: 14px; color: var(--sub); text-decoration: none; }
.doc h1 { font-size: 32px; margin: 18px 0 6px; }
.doc .meta { color: var(--sub); font-size: 14px; margin: 0 0 28px; }
.doc h2 { font-size: 18px; margin: 34px 0 10px; font-weight: 700; }
.doc p { margin: 0 0 14px; color: #334155; }
.doc ul { margin: 0 0 14px; padding-left: 22px; color: #334155; }
.doc li { margin: 5px 0; }
.doc li::marker { color: #94a3b8; }
.doc .sign { margin-top: 40px; padding-top: 20px; border-top: 1px solid var(--line); color: var(--sub); font-size: 14px; }

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
  .hero .wrap { grid-template-columns: 1fr; gap: 36px; }
  h1 { font-size: 34px; }
  .grid { grid-template-columns: repeat(2, 1fr); }
  .shots { grid-template-columns: repeat(2, 1fr); }
  .privacy-band { grid-template-columns: 1fr; padding: 28px; }
  .hero-art { order: 2; }
  .phone { width: 262px; }
}

@media (max-width: 560px) {
  .nav a:not(.pill) { display: none; }
  h1 { font-size: 30px; }
  .lede { font-size: 16px; }
  .grid, .shots { grid-template-columns: 1fr; }
  section { padding: 40px 0; }
  .sec-head h2 { font-size: 24px; }
  .privacy-band h2 { font-size: 22px; }
}